26 
A SHORT ACCOUNT OF WORK ON PYCNO= 
GONIDA DONE DURING JUNE, 1911, AT 
CULLERCOATS. 
By valentine D061EL, Lecturer in Zoology of the University 
OF St. Petersburg. 
During my stay at Cullercoats collections were made on 
the shore, and the following species were found between tide 
marks to the north of Cullercoats Bay: — 
Phoxichilidium femoratum (Eathke) on the under 
surface of stones covered Avith Sertularia. 
Ancvphia i^etiolata (Kroyer), ibid. 
Pcdlene hi-evivostris Johnston, ibid . 
Phoxichihis circnlans (Goodsir) ?, one young specimen, 
ibid. 
N i/mphon riibrum. Hodge, ibid. 
Ammothea hispida (Hodge), ibid. 
P ycnogonum littorale (Strom), on the under surface of 
stones coA^ered AAuth ClaAm multicornis ; also 
often attached to Actinia and Tealia. 
The development of two species, Anaphia petiolata and 
Pycnogonum littorcde Avas followed. The laiwse of both 
species pass through a parasitic stage. In the case of 
Anaphia petiolata the six-legged larvae Avhich Avere found in 
the polypes of C ampamdaria flexuosa (Hincks), are chai'ac- 
terised by the uncommonly strong development of the last 
joint of the second and third pair of legs, and by the 
complete absence of eyes. The way in Avhich the laiwae 
enter the polypes was obseiwed, and the duration of the 
parasitic stage Avas found to be from 8 to 10 days. After 
this period the larva moults and leaA’es its host. It now 
differs from the adult form in the absence of ovigerous legs 
and the incomplete deA^elopment of the last pair of legs. 
The parasitic stage of Pycnogonum littorale has not 
previously been obserA^ed although the species is so common, 
but tliis is perhaps due to the fact that in this stage it differs 
